267395-69-7 RNA, (P-deoxy-P-(dimethylamino))(2',3'-dideoxy-2',3'-imino-2',3'-seco)(2'-5')(A-C-G-m5U-m5U-G-A-G-G-G-G-C-A-m5U-C-G-m5U-C-G-C) 20